1. Hot gas cleaning in biomass gasification Skoblja S., Malecha J., Koutský B., Solich M. 16.09.2004 ICT Prague Department of Gas, Coke and Air Protection Faculty of Environmental Technology

2. Biomass gasification biomass+O 2 +(N 2 )+(H 2 O)  gas + C n H m +tar +dust

3. Process Temperature

4. Catalytic Tar Removal (model) toluene: 3 g.m -3 add H 2 O: 26,0 g.m -3 ; flow 108 ml.min -1,GHSV=8200; 35,8% CO 2 ; 47,6% N 2 ; 16,6% H 2 naphthalene: 1,6 g.m -3 add H 2 O: 24,4 g.m -3 ; flow 112 ml.min -1,GHSV=8900; 21,0% CO 2 ; 70,1% N 2 ; 8,9% H 2

5. Hot Gas Cleaning on Dolomite Biomass + PETF (25%) fluid gasification Catalyst: 0,5 l dolomite, GSHV=1000, Hot Filter: river sand 0,16-0,50 mm, V=150 ml 525°C, gas flow 0,5 m 3.h -1, dust 3,7 g.m -3

6. Catalytic Tar Removal (real gas) Gas composition before and after catalytic reactor 1 wood pellet air gasification, downdraft gasifier, feed ratio: 5,8 kg.h -1, total gas flow 10-14 m 3.h -1, reactor gas flow 1 m 3.h -1 (dust <10 g.m -3, High tar<1 g.m -3 ) catalyst G 56A, 240 g, 530°C,add water: 131 g.h -1.m -3 GHSV=4700 1 Equipment were located on NTNU, Department of Thermal Energy and Hydropower, Hustad J., Risner H. Horizontal bed filter 1 D= 85mm Area=57cm 2 1: 250 ml olivine sand, d p =0,351 mm 2: 250 ml G56A, d p =1-2 mm Gas flow: 1,0 nm 3.h -1

7. Hot Gas Cleaning

8. Desulphurization dolomite (CaMg(CO 3 ) 2 ) Available materials: ZnO (ZnO-TiO), Fe 2 O 3 (Fe), CaO, MnO (MnO,Fe 2 O 3,CaO) CuO (Cu), NiO (Ni) T1T1 T2T2

9. Thermodynamics Equilibrium H 2 S concentration in dependence on H 2 O and temperatures

10. Kinetics Temperature Influence on desulphurization rate dolomite (2MPa) Calcinated dolomite (2MPa)

11. Kinetics Influence of calcinations and H 2 S concentration on reaction rate Calcinated and half calcinated dolomite ( 750 °C, 2MPa) Partial pressure H 2 S on reaction rate ( 750 °C, 2MPa)

12. Desulphurization apparatus Gas flow: 50 l.h -1 dp=0.315-0.500 mm, (5-12g) C(H 2 S)=500 ppm (760 mg.m -3 )

13. Output gas composition Gas flow: 50 l.h -1, C input (H 2 S)=760 (843) mg.m -3

14. Output concentration H 2 S Gas flow: 50 l.h -1, C input (H 2 S)=760 (843) mg.m -3